When you are too lazy to type " I don't know " . So you use idk .
Somebody : What are you doing ?
Me: Idk
I dont know man. no one does. the legend is that nobody's known since the begining of time.
What's for lunch?
IDK, what doe sit mean?
Broooo, deep
idk is the shortened version of I Don't Know. You can ask "what does idk and idc mean" to either get an answer or I dont know and i dont care.
"What word is this definition about?"
"idk"
Meaning the person does know they just don’t wanna say yes🤨!! SHOULD IMMEDIATELY APOLOGIZE
Are you mad at me?
Them:idk